Pondus
2
avast will detect known versions, but the bad guys release new undetected versions frequently
to my knowledge you have to pay to decrypt … backup is the solution
removal help you get here for free. Follow instructions here https://forum.avast.com/index.php?topic=53253.0
attach Malwarebytes and Farbar Recovery Scan Tool logs here
then essexboy will assist you when he is online later today, usually after work hours european time